This is a picture of a calendar with the number 12 in the center of it. it's got two rings on the top that hold the pages together and a bar on top where the month's name would be

This Calendar 12 icon is made in Material Design style developed by Google. This style is based on extremely simplified shapes, thin two-pixel lines, and is optimized for 24x24 px. Unlike other vector icon packs that have merely hundreds of icons, this icon pack contains 6,000 icons, all in the same style and quality.